使用vivado进行观测PLL模块输出的时钟,发现正好顺序反了,不知道哪里有问题。
代码:
`timescale 1ns / 1ps
//////////////////////////////////////////////////////////////////////////////////
// Company:
// Engineer:
//
// Create Date: 2016/09/28 15:04:30
// Design Name:
// Module Name: led
// Project Name:
// Target Devices:
// Tool Versions:
// Description:
//
// Dependencies:
//
// Revision:
// Revision 0.01 - File Created
// Additional Comments:
//
//////////////////////////////////////////////////////////////////////////////////
module led(
input sys_clk,
output reg [3:0] led
);
reg[31:0] timer_cnt;
(*mark_debug = "TRUE"*)wire clk_65MHz;
(*mark_debug = "TRUE"*)wire clk_455MHz;
(*mark_debug = "TRUE"*)wire lock;
(*mark_debug = "TRUE"*)wire pro_out0,pro_out1;//reset pll
//assign clk_in=sys_clk;
//主体部分
ila_1 m_ila(
.clk(sys_clk),
.probe0(clk_65MHz),
.probe1(clk_455MHz),
.probe2(pro_out0),
.probe3(lock)
);
clk_wiz_0 m_clk (
// Clock in ports
.clk_in1(sys_clk),
// Clock out ports
.clk_out1(clk_65MHz),
.clk_out2(clk_455MHz),
// Status and control signals
.reset(pro_out0),
.locked(lock)
);
vio_1 m_vio(
.clk(sys_clk),
.probe_in0(),
.probe_in1(),
.probe_out0(pro_out0),
.probe_out1(pro_out1)
);
always@(posedge sys_clk)
begin
if(timer_cnt >= 32'd49_999_999)
begin
led <= ~led;
timer_cnt <= 32'd0;
end
else
begin
led <= led;
timer_cnt <= timer_cnt + 32'd1;
end
end
endmodule
就想知道为什么65MHz和455MHz顺序正好反了?